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moby--moby/daemon/getsize_unix.go

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// +build linux freebsd solaris
package daemon
import (
"github.com/Sirupsen/logrus"
"github.com/docker/docker/container"
)
// getSize returns the real size & virtual size of the container.
func (daemon *Daemon) getSize(container *container.Container) (int64, int64) {
var (
sizeRw, sizeRootfs int64
err error
)
if err := daemon.Mount(container); err != nil {
logrus.Errorf("Failed to compute size of container rootfs %s: %s", container.ID, err)
return sizeRw, sizeRootfs
}
defer daemon.Unmount(container)
sizeRw, err = container.RWLayer.Size()
if err != nil {
logrus.Errorf("Driver %s couldn't return diff size of container %s: %s",
daemon.GraphDriverName(), container.ID, err)
// FIXME: GetSize should return an error. Not changing it now in case
// there is a side-effect.
sizeRw = -1
}
if parent := container.RWLayer.Parent(); parent != nil {
sizeRootfs, err = parent.Size()
if err != nil {
sizeRootfs = -1
} else if sizeRw != -1 {
sizeRootfs += sizeRw
}
}
return sizeRw, sizeRootfs
}